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Vacuum Diaphragm Unit Test

  1. Remove hose from vacuum diaphragm. If transmission fluid is present on vacuum side of diaphragm unit, replace unit. Fluid indicates diaphragm in unit is defective.
    NOTE: If replacing vacuum diaphragm unit, ensure correct replacement is used. Diaphragm units may appear identical, but cannot be interchanged.
  2. Attach a vacuum pump to diaphragm unit. Apply 18 in. Hg of vacuum. If gauge reading holds steady, diaphragm unit is good. If gauge reading drops, diaphragm unit is defective and must be replaced.
  3. Remove diaphragm unit from transmission. Apply 18 in. Hg of vacuum. Hold finger over end of unit control rod. When hose is removed, diaphragm unit should push control rod out. Replace as necessary.
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